Answer: Physical changes in nature could then be erosion in a mountain, the melting of snow, and a river freezing over from the cold. Since none of these changes affect the chemical composition of the mountain, the snow, or the river, they are physical changes.
Explanation:
210 Pb ---> -ie + 210 B:
84 8.3
Without being provided a list of items, I would have to generally say that everything around you is matter. There are a few exceptions to this list, but a general rule of thumb is anything you can touch, taste, smell or hold would be considered matter. Sound, light, time (Dr. Who may disagree) and heat would be considered non-matter items.
Answer: 3
Explanation:
Lithium always has 3 protons bc it’s atomic number is 3 which is determined by its amount of protons.
Answer: A = square root (2/L)
Explanation: find the attached file for explanation
